I activated the plugin, did some work, then put the plugin activate setting to False and saved.
Unfortunately, it is now acting weird and has done something to my site.
I can view all posts. But I cannot view any pages - including the home page. All pages have the maintenance mode image, even though the plugin is not on. I even deactivated the plugin, then deleted the plugin entirely and I am still getting the same thing happening.
I reinstalled the plugin hoping that would make a difference but it didn't.
I can confirm that the pages I am viewing are not cached. I cleared all cache, tried on another browser, and even tried on my phone, hoping it may have been a cache problem and my browser was acting weird. I had the same problem on all devices / browsers, even browsers where I have never visited the website before so it didn't even have any cache for that website.